332 lines
8.4 KiB
PHP
332 lines
8.4 KiB
PHP
<?php
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/**
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* @author Vincent Petry <pvince81@owncloud.com>
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*
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OCA\DAV\Connector\Sabre;
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use OC\Files\View;
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use Sabre\DAV\Exception\NotFound;
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use Sabre\DAV\Exception\PreconditionFailed;
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use Sabre\DAV\Exception\ReportNotSupported;
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use Sabre\DAV\Exception\BadRequest;
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use Sabre\DAV\ServerPlugin;
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use Sabre\DAV\Tree;
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use Sabre\DAV\Xml\Element\Response;
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use Sabre\DAV\Xml\Response\MultiStatus;
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use Sabre\DAV\PropFind;
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use OCP\SystemTag\ISystemTagObjectMapper;
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use OCP\IUserSession;
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use OCP\Files\Folder;
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use OCP\IGroupManager;
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use OCP\SystemTag\ISystemTagManager;
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use OCP\SystemTag\TagNotFoundException;
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class FilesReportPlugin extends ServerPlugin {
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// namespace
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const NS_OWNCLOUD = 'http://owncloud.org/ns';
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const REPORT_NAME = '{http://owncloud.org/ns}filter-files';
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const SYSTEMTAG_PROPERTYNAME = '{http://owncloud.org/ns}systemtag';
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/**
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* Reference to main server object
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*
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* @var \Sabre\DAV\Server
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*/
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private $server;
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/**
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* @var Tree
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*/
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private $tree;
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/**
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* @var View
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*/
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private $fileView;
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/**
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* @var ISystemTagManager
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*/
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private $tagManager;
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/**
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* @var ISystemTagObjectMapper
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*/
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private $tagMapper;
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/**
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* @var IUserSession
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*/
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private $userSession;
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/**
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* @var IGroupManager
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*/
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private $groupManager;
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/**
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* @var Folder
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*/
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private $userFolder;
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/**
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* @param Tree $tree
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* @param View $view
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*/
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public function __construct(Tree $tree,
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View $view,
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ISystemTagManager $tagManager,
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ISystemTagObjectMapper $tagMapper,
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IUserSession $userSession,
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IGroupManager $groupManager,
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Folder $userFolder
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) {
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$this->tree = $tree;
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$this->fileView = $view;
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$this->tagManager = $tagManager;
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$this->tagMapper = $tagMapper;
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$this->userSession = $userSession;
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$this->groupManager = $groupManager;
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$this->userFolder = $userFolder;
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}
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/**
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* This initializes the plugin.
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*
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* This function is called by \Sabre\DAV\Server, after
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* addPlugin is called.
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*
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* This method should set up the required event subscriptions.
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*
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* @param \Sabre\DAV\Server $server
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* @return void
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*/
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public function initialize(\Sabre\DAV\Server $server) {
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$server->xml->namespaceMap[self::NS_OWNCLOUD] = 'oc';
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$this->server = $server;
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$this->server->on('report', array($this, 'onReport'));
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}
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/**
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* Returns a list of reports this plugin supports.
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*
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* This will be used in the {DAV:}supported-report-set property.
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*
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* @param string $uri
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* @return array
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*/
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public function getSupportedReportSet($uri) {
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return [self::REPORT_NAME];
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}
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/**
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* REPORT operations to look for files
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*
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* @param string $reportName
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* @param [] $report
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* @param string $uri
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* @return bool
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* @throws NotFound
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* @throws ReportNotSupported
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*/
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public function onReport($reportName, $report, $uri) {
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$reportTargetNode = $this->server->tree->getNodeForPath($uri);
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if (!$reportTargetNode instanceof Directory || $reportName !== self::REPORT_NAME) {
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throw new ReportNotSupported();
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}
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$ns = '{' . $this::NS_OWNCLOUD . '}';
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$requestedProps = [];
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$filterRules = [];
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// parse report properties and gather filter info
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foreach ($report as $reportProps) {
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$name = $reportProps['name'];
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if ($name === $ns . 'filter-rules') {
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$filterRules = $reportProps['value'];
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} else if ($name === '{DAV:}prop') {
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// propfind properties
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foreach ($reportProps['value'] as $propVal) {
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$requestedProps[] = $propVal['name'];
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}
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}
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}
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if (empty($filterRules)) {
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// an empty filter would return all existing files which would be slow
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throw new BadRequest('Missing filter-rule block in request');
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}
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// gather all file ids matching filter
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try {
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$resultFileIds = $this->processFilterRules($filterRules);
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} catch (TagNotFoundException $e) {
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throw new PreconditionFailed('Cannot filter by non-existing tag', 0, $e);
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}
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// find sabre nodes by file id, restricted to the root node path
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$results = $this->findNodesByFileIds($reportTargetNode, $resultFileIds);
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$responses = $this->prepareResponses($requestedProps, $results);
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$xml = $this->server->xml->write(
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'{DAV:}multistatus',
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new MultiStatus($responses)
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);
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$this->server->httpResponse->setStatus(207);
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$this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
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$this->server->httpResponse->setBody($xml);
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return false;
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}
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/**
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* Find file ids matching the given filter rules
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*
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* @param array $filterRules
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* @return array array of unique file id results
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*
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* @throws TagNotFoundException whenever a tag was not found
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*/
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public function processFilterRules($filterRules) {
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$ns = '{' . $this::NS_OWNCLOUD . '}';
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$resultFileIds = null;
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$systemTagIds = [];
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foreach ($filterRules as $filterRule) {
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if ($filterRule['name'] === $ns . 'systemtag') {
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$systemTagIds[] = $filterRule['value'];
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}
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}
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// check user permissions, if applicable
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if (!$this->isAdmin()) {
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// check visibility/permission
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$tags = $this->tagManager->getTagsByIds($systemTagIds);
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$unknownTagIds = [];
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foreach ($tags as $tag) {
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if (!$tag->isUserVisible()) {
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$unknownTagIds[] = $tag->getId();
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}
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}
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if (!empty($unknownTagIds)) {
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throw new TagNotFoundException('Tag with ids ' . implode(', ', $unknownTagIds) . ' not found');
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}
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}
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// fetch all file ids and intersect them
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foreach ($systemTagIds as $systemTagId) {
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$fileIds = $this->tagMapper->getObjectIdsForTags($systemTagId, 'files');
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if (empty($fileIds)) {
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// This tag has no files, nothing can ever show up
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return [];
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}
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// first run ?
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if ($resultFileIds === null) {
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$resultFileIds = $fileIds;
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} else {
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$resultFileIds = array_intersect($resultFileIds, $fileIds);
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}
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if (empty($resultFileIds)) {
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// Empty intersection, nothing can show up anymore
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return [];
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}
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}
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return $resultFileIds;
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}
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/**
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* Prepare propfind response for the given nodes
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*
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* @param string[] $requestedProps requested properties
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* @param Node[] nodes nodes for which to fetch and prepare responses
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* @return Response[]
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*/
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public function prepareResponses($requestedProps, $nodes) {
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$responses = [];
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foreach ($nodes as $node) {
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$propFind = new PropFind($node->getPath(), $requestedProps);
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$this->server->getPropertiesByNode($propFind, $node);
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// copied from Sabre Server's getPropertiesForPath
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$result = $propFind->getResultForMultiStatus();
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$result['href'] = $propFind->getPath();
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$resourceType = $this->server->getResourceTypeForNode($node);
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if (in_array('{DAV:}collection', $resourceType) || in_array('{DAV:}principal', $resourceType)) {
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$result['href'] .= '/';
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}
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$responses[] = new Response(
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rtrim($this->server->getBaseUri(), '/') . $node->getPath(),
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$result,
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200
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);
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}
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return $responses;
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}
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/**
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* Find Sabre nodes by file ids
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*
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* @param Node $rootNode root node for search
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* @param array $fileIds file ids
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* @return Node[] array of Sabre nodes
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*/
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public function findNodesByFileIds($rootNode, $fileIds) {
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$folder = $this->userFolder;
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if (trim($rootNode->getPath(), '/') !== '') {
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$folder = $folder->get($rootNode->getPath());
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}
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$results = [];
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foreach ($fileIds as $fileId) {
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$entry = $folder->getById($fileId);
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if ($entry) {
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$entry = current($entry);
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if ($entry instanceof \OCP\Files\File) {
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$results[] = new File($this->fileView, $entry);
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} else if ($entry instanceof \OCP\Files\Folder) {
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$results[] = new Directory($this->fileView, $entry);
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}
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}
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}
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return $results;
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}
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/**
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* Returns whether the currently logged in user is an administrator
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*/
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private function isAdmin() {
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$user = $this->userSession->getUser();
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if ($user !== null) {
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return $this->groupManager->isAdmin($user->getUID());
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}
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return false;
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}
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}
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